Great photos! I'm a little confused about the designation of the single barreled 20mm as the Mark 12 Mod 3. As far as I knew that was the XM31 system which consisted of a M24A1 20mm cannon mounted on a UH-1B. Are these photos from your personal collection?
Here's some pics from teh Army Aviation Museum of the M24A1:
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Also, never seen the XM61 three barreled 20mm cannon mounted fixed like that. I have seen it mounted in the door though:
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Also, here's the abbreviated XM-61 system mounted in the door of a UH-1B:
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Really cool stuff you got there. Keep em coming!
Ray